Questi sono stati i riferimenti di cui abbiamo usufruito:\\

[1]  Platform Versions \\ \url{http://developer.android.com/about/dashboards/index.html} \\

[2] Drawable Resources \\ \url{http://developer.android.com/guide/topics/resources/drawable-resource.html} \\

[3] Draw 9-patch \\ \url{http://developer.android.com/tools/help/draw9patch.html} \\

[4] Android Supported Media Formats \\ \url{http://developer.android.com/guide/appendix/media-formats.html} \\

[5] PNG versus GIF \\ \url{http://www.w3.org/QA/Tips/png-gif} \\











